Avatar Legends Of The Arena Help ?

I downloaded Avatar Legend from nick.com and downloaded from there but then i heard that a new version came out on avatarlegend.com that looked the same just the address was different so are both the same versions? also does anybody know any codes other then like boulder,dragon,air temple,western air temple,the fire lords name i forgot it... and thats all i forgot the rest because i lost the paper...some of them don't work but i forgot which..... sorry... also when ever i play online why do some people kill me in like 1 or 2 hits?